\begin{table}%t3
\par
\caption{\label{t:detlim}Data used for transient search.}
\renewcommand{\multirowsetup}{%\centering
}
%\centerline
 {\begin{tabular}{lrccc}
\hline
\hline
\noalign{\smallskip}
Date      & Exposure & Seeing & 90\% detection  & Area$^c$ \\
& [min] & [arcsec] & efficiency [mag]  &   [arcmin$^2$] \\
\hline
\noalign{\smallskip}
\multicolumn{5}{c}{Abell 1689 -- VLT/ISAAC $SZ$-band}\\
2003 02 09$^b$  &  159 &   0.52     & 24.28, transient  &  \multirow{4}{10.5mm}{3.70}\\
2003 04 27      &    43 &   0.43     & transient  &  \\
2004 01 13      &    43 &   0.52     & 23.58, non-detect & \\
2004 02 14      &    43 &   0.58     & 23.64, non-detect & 	\\
\hline                                                   
2003 01 16      &    43 &   0.58     & 23.48 &   \multirow{4}{10.5mm}{3.72} \\
2003 02 15      &    43 &   0.50     & 23.60 &  \\
2003 04 27      &    86 &   0.44     &  & \\
2004 01 12      &    43 &   0.55     & 23.64 & \\
\hline                                                    
2007 04 08      &   117 &   0.64 &  23.95 & \multirow{3}{10.5mm}{4.44}\\
2007 05 14/15   &   117 &   0.65 &  23.95 &  \\
2007 06 06      &    39 &   0.70 &  23.15 &  \\
\hline
\multicolumn{5}{c}{AC 114 -- VLT/ISAAC $J$-band}\\
2002 08 20 &      108   &   0.49 & 23.87  &  \multirow{5}{10.5mm}{5.06}\\
2007 07 13$^a$ &  234   &   0.43 & 24.04  & \\
2007 08 09 &      117   &   0.73 & 23.79  & \\
2007 09 02 &      117   &   0.55 & 23.83  & \\
2007 09 28 &      117   &   0.46 & 24.04  &  \\
\hline
\multicolumn{5}{c}{Abell 1835 -- VLT/ISAAC $SZ$-band}\\
area 1          &       &        &       &   \\
2004 04 20      & 231 	&   0.49 & 24.06 &  3.75 \\ 
2004 05 15	& 135 	&   0.62 & 24.06   	 &  3.75  \\
2007 04 18	& 117 	&   0.79 & 23.80     &  2.50  \\ 
2007 05 18	& 78  	&   0.74 & 23.83     &  3.75  \\
2007 07 18	& 117 	&   0.62 & 23.80     &  2.50 	\\
area 2    	&     	&        &	 &   \\
2007 04 18      & 117 	&   0.79 & 23.70 &  1.57 \\
2007 05 14/18   & 60  	&   0.80 & 23.45 &  2.13 \\
2007 07 18      & 117 	&   0.62 & 23.70 &  1.57 \\
\hline
\end{tabular} }
\par
\smallskip
$^a$  Average of observations obtained on July 11, 12, 13 and 15. \\
$^b$  Average of observations obtained on February 5, 11 and 15. \\
$^c$  Overlap region with other images to which the detection limit in Col.~4 applies.
\end{table}